const fs = require("fs");

fs.readFile("./test/a.txt", (err1, data1) => {
    fs.readFile("./test/b.txt", (err2, data2) => {
        fs.readFile("./test/c.txt", (err3, data3) => {
            if (data1) console.log(data1.toString());
            if (data2) console.log(data2.toString());
            if (data3) console.log(data3.toString());
        });
    });
});



